mirror of
https://github.com/flutter/flutter
synced 2024-10-13 19:52:53 +00:00
88cd043d01
Fixes some tests that weren't aggressively catching exceptions. Fixes some actual failures that were found because of this. Tries to fix an intermittent failure with crash1_test.dart which could be a race condition.
60 lines
1.7 KiB
Dart
60 lines
1.7 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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class RenderDots extends RenderConstrainedBox {
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RenderDots() : super(additionalConstraints: const BoxConstraints.expand());
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// Makes this render box hittable so that we'll get pointer events.
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@override
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bool hitTestSelf(Offset position) => true;
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final Map<int, Offset> _dots = <int, Offset>{};
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@override
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void handleEvent(PointerEvent event, BoxHitTestEntry entry) {
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if (event is PointerDownEvent || event is PointerMoveEvent) {
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_dots[event.pointer] = event.position;
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markNeedsPaint();
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} else if (event is PointerUpEvent || event is PointerCancelEvent) {
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_dots.remove(event.pointer);
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markNeedsPaint();
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}
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}
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@override
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void paint(PaintingContext context, Offset offset) {
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final Canvas canvas = context.canvas;
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canvas.drawRect(offset & size, new Paint()..color = const Color(0xFF0000FF));
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final Paint paint = new Paint()..color = const Color(0xFF00FF00);
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for (Offset point in _dots.values)
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canvas.drawCircle(point, 50.0, paint);
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super.paint(context, offset);
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}
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}
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class Dots extends SingleChildRenderObjectWidget {
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const Dots({ Key key, Widget child }) : super(key: key, child: child);
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@override
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RenderDots createRenderObject(BuildContext context) => new RenderDots();
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}
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void main() {
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runApp(
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const Directionality(
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textDirection: TextDirection.ltr,
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child: const Dots(
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child: const Center(
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child: const Text('Touch me!'),
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),
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),
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),
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);
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}
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